Welding composition.



' com: A. HOPE, or. MONTREAL, QUEBEC, CANADA.

WELDING COMPOSITION.

No Drawing.

To all'whom it may concern Be it known that I, JOHN ALEXANDER HOPE, ofthe city of Montreal, in the Province of Quebec, Dominion of Canada,have invented new and useful Improvements in WVelding Compositions; andI do hereby declare that the following is a full, clear, and exactdescription thereof.

My invention relates particularly to the welding of a cutting edge ofhigh speed steel to a low carbon steel shank; and has for its object toenable a perfect weld to be obtained without the necessity of anyseparate processes for rehardening the edge after the weld.

The invention may be said briefly to consist of a welding compositioncomprising ferro-manganese, ferro-silicon and burnt borax in thefollowing proportions: 80% ferro-manganese 60 parts, ferro-silicon 20parts, burnt borax 20 parts. These ingredients are in granular orpulverulent form and they are mixed cold and dry in anysuitable-vibratory receptacle.

,he manner in which I use my composition is as follows: I first pre-heatboth the low carbon steel shank and the high-speed steel edge member toapproximately 1500 Fahrenheit in a closed coke furnace, and thistemperature is maintained for a sufiicient time to thoroughly heat theparts. About three minutes is necessary for comparatively small cuttingtools such as are used in lathes. The parts are then withdrawn and whilehot the faces to be welded have the welding mixture applied thereto. Thefaces are then brought together and the article put in the press andthere subjected to a light pressure, approximately 300 pounds for abouthalf a minute. This pressure is varied according to the area of the faceto be welded, the larger the face the greater the pressure. The

is then. removed from the press, ,the edge member bein lightly attachedto the shank, and the we ding composition evenly distributed and closelypacked between the faces. The tool is then given its final heating inthe same furnace, a forced blast be- Specification of Letters Patent.

Patented Dec. 26, 1916.

Application filed April 10, 1916. Serial No. 90,252.

ing used and the temperature raised to the welding point, the whiteheat, say, for instance, with comparatively small tools from 2100 to2500. This temperature causes the mixture between the faces to fiow andwhen the flux is completed the tool is again withdrawn from the furnaceand returned to the press where it is subjected to a final pressure offrom approximately 200 pounds to 1000 pounds according to the size ofthe tool and the area of the face being welded, and this pressureisimaintained until all working of the fluxed composition ceases. Aperfect weld is thus obtained. The tool is then removed.-f rom, he;press and thehigh-speed steel .fa'c e 1is'iinmediately subjected to acold air blast, thus giving to the cutting edge the required hardness todo any work required of high-speed steel cutting tools. v e

In the welding of very small tool parts with small faces to be weldedthe prop0rtion of ferro-manganese may be reduced without departing fromthe spirit of my .20 parts; and burnt borax 20 parts.

2. A high-speed steel and low carbon iron welding composition consistingof ferromanganese, ferro-silicon and burnt borax.

In testimony whereof I have signed my name to this specification in thepresence of two witnesses. I JOHN A. HOPE. Witnesses:

WILLIAM HEWETSON, GoRDoN Gr. CooKE.

